diff --git a/SignalServiceKit/src/Contacts/TSThread.h b/SignalServiceKit/src/Contacts/TSThread.h
index d0998d905..daf08b30e 100644
--- a/SignalServiceKit/src/Contacts/TSThread.h
+++ b/SignalServiceKit/src/Contacts/TSThread.h
@@ -43,7 +43,7 @@ extern ConversationColorName const kConversationColorName_Default;
 @property (nonatomic) NSInteger friendRequestStatus __deprecated_msg("use OWSPrimaryStorage.getFriendRequestStatusForContact:transaction: instead");
 @property (nonatomic, readonly) BOOL isContactFriend;
 // ========
-@property (atomic, readonly) BOOL isSlaveThread;
+@property (nonatomic, readonly) BOOL isSlaveThread;
 
 /**
  *  Whether the object is a group thread or not.